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NET INCOME PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Share | The following table presents the computation of basic and diluted net income per share attributable to Intuitive Surgical, Inc. for the three and nine months ended September 30, 2018, and 2017 (in millions, except per share amounts):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income attributable to Intuitive Surgical, Inc. | $ | 292.5 |  |  | $ | 298.6 |  |  | $ | 835.4 |  |  | $ | 702.4 |
Denominator: |  |  |  |  |  |  |
Weighted average shares outstanding used in basic calculation | 114.0 |  |  | 111.8 |  |  | 113.4 |  |  | 111.6 |
Add: dilutive effect of potential common shares | 5.2 |  |  | 5.0 |  |  | 5.2 |  |  | 4.3 |
Weighted average shares outstanding used in diluted calculation | 119.2 |  |  | 116.8 |  |  | 118.6 |  |  | 115.9 |
Net income per share attributable to Intuitive Surgical, Inc.: |  |  |  |  |  |  |
Basic | $ | 2.57 |  |  | $ | 2.67 |  |  | $ | 7.37 |  |  | $ | 6.29 |
Diluted | $ | 2.45 |  |  | $ | 2.56 |  |  | $ | 7.04 |  |  | $ | 6.06 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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